Duration of drilling with type of burr

Changes in hearing as measured by PTA, DPOAE, TEOAE

n (%)

Mean drill time (min)

p value

Total

No

Yes

12 (20%)

46 (80%)

43.64

57.03

0.002

Significant

Diamond

No

Yes

12 (20%)

46 (80%)

16.04

19.74

0.103

Not significant

Cutting

No

Yes

12 (20%)

46 (80%)

27.60

37.29

0.005

Significant